Diffusion mechanisms of compact surface clusters: Ir sub 7 on Ir(111)

Diffusion of compact hexagonal Ir sub 7 on Ir(111) is examined to identify mechanisms by which diffusion takes place and to find an explanation for the unusually high prefactors measured experimentally. From molecular dynamics, the analysis of displacement patterns, and total energy calculations, va...

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Bibliographic Details
Published in:Surface science 2000-12, Vol.470 (1-2), p.L45-L51
Main Authors: Kurpick, U, Fricke, B, Ehrlich, G
Format: Article
Language:English
Online Access:Get full text
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Summary:Diffusion of compact hexagonal Ir sub 7 on Ir(111) is examined to identify mechanisms by which diffusion takes place and to find an explanation for the unusually high prefactors measured experimentally. From molecular dynamics, the analysis of displacement patterns, and total energy calculations, various non-equivalent processes are found which preserve the overall cluster shape as in the experiments. For these processes, prefactors are calculated from the local vibrational density of states. Based on the results we suggest that the high prefactors are contributed by the large number of diffusion processes available.
ISSN:0039-6028